Siemens ET 790 Series Informações Técnicas descarregar pdf (Página 253)

Application Examples

System overview

18/5

Siemens ET G1 · 10/2008

System data

Bus cable

• Cable type mm

YCYM 2 x 2 x 0.8

One core pair (red, black) for signal transmission and power supply,

One core pair (yellow, white) for additional applications (SELV or voice)

Cable length

• Cable lengths of one line in total (core diameter: 0.8 mm) m Max. 1000 (including all junctions)

• Length between two bus devices m Max. 700

• Length between bus device and

power supply unit (320 mA)/reactor

m Max. 350

• Length between power supply unit (320 mA) and reactor Side-by-side mounting necessary

(on standard mounting rail with integrated data rail)

Bus devices

• Number of areas Max. 15

• Number of lines per area Max. 15

• Number of bus devices per line Max. 64

Topology Line, star or tree structure

Power supply

• Power supply V DC 24 (SELV safety extra-low voltage)

• Power supply units per line One power supply unit (160, 320 or 640 mA)

• Power supply units per line for high current demand Max. two power supply units at a distance of at least 200 m

Transmission

• Transmission technology Distributed, event-controlled, serial, symmetric

•Baud rate bit/s 9600

Device features (unless otherwise specified)

Degree of protection according to EN 60529 IP 20

Protective measure Bus: safety extra-low voltage SELV 24 V DC

Overvoltage category III

Rated insulation voltage U

V 250

Degree of pollution 2

EMC requirements Complies with EN 50081-1 and prEN 50082-2 (severity 3),

prEN 50090-2-2, KNX/EIB manual

Resistance to climate prEN 50090-2-2, KNX/EIB manual

Operating conditions

• Application For fixed installation indoors, for dry rooms and

installation in heavy-current distribution boards

• Ambient operating temperature °C -5 to +45

• Humidity in operation % Max. 93

• Storage temperature °C -40 to +55

• Humidity in storage % Max. 93

Certification KNX/EIB certified

CE marking Compliant with EMC Directive (residential and non-residential buildings),

Low Voltage Directive

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